for just a minute grace lee paused before the blank door of the safe, then she passed around to an unused speaking tube in the neighboring wall. halting before it, in low but distinct tones she began to sing the famous aria from "the magic flute."

all agog, with eyes starting and ears alert, the man behind listened and watched. nothing happened.

then came a change. gradually her voice rose, sweet and piercing, till it reached that famous f in alt so rarely attempted, so exciting to the ear when fairly taken and fairly held. grace lee could take it, and as it hung, sweet[98] and deliciously thrilling in the air, beau johnson saw, to his amazement, though he was in a way prepared for it, the heavy safe door slip softly ajar. she had done it with her voice. how, he could only vaguely guess. he was better educated than most of his class, or he could not have understood it at all. as it was, he laid it to the vibration caused by a certain definite note acting on some delicate mechanism set in accord with that note, which mechanism starting another and a stronger one gradually led up to that which drew the bolts and set the door ajar. whether his theory were true or not mattered little at the moment. the event for which he waited had been accomplished and accomplished before his eyes. to profit by it was his next thought, and to this end he held himself ready for the spring which had laid latent in his[99] eyes since he first saw her advance toward the safe.

she was ignorant of his presence. this was evident from the jaunty way she turned from the tube, still singing, but in a desultory way, which showed that her thoughts were no longer on her music. but she was not so engrossed that she did not see him. the moment that her face turned his way, her eyes enlarged, her body stiffened, her whole personality took on power and purpose and she sprang more quickly than he did and shut the safe door with one quick movement of her hand that fastened it as securely as before. then she drew herself up to meet his rush, a noble figure of resolute womanhood which any other man would have hesitated to assail. but he was proof to any appeal of this kind. she had been quicker than he who was esteemed the[100] readiest in his class, and he owed her a grudge, if only for that. smiling—it was a way of his when deeply moved or deeply dangerous—he accosted her with smooth and treacherous words.

"don't scream, young lady; screaming will do you no good. mr. fellows has left the business to me and i am quite competent to manage it. i am from headquarters—a detective. yesterday you aroused the manager's suspicions, and i was detailed this morning to watch you. what do you want from mr. stoughton's safe? an honest answer may help you. nothing else will."

"i want——" she hesitated, eyeing him over with an insight and an undoubted air of self-command which told the hardy rascal that in this woman he was likely to meet his match. "i want some securities of mr. stoughton's which he has ordered me to dispose of for him. i am in his confidence, as i can prove to you if you will give me the opportunity. i have papers at home that will satisfy any one of my right to open this safe and to negotiate such papers as are designated in mr. stoughton's cablegrams."

"i don't doubt it." the words came easily from the mobile lips of the wily beau johnson. "but it was not to do mr. stoughton's business that you opened the safe just now. you have had no orders to-day; you had no order yesterday. another purpose is in your mind—a personal purpose. it is this abuse of mr. stoughton's confidence which brings me here. you want three thousand dollars badly!"